"The people of California will not be bowed by the Trump Administration's brazen aggression and intimidation tactics," Pelosi tweeted. "We will fight this sham lawsuit and will fight all cowardly attacks on our immigrant communities."

The people of California will not be bowed by the Trump Administration's brazen aggression and intimidation tactics. We will fight this sham lawsuit and will fight all cowardly attacks on our immigrant communities. #ProtectDREAMers

The Justice Department filed a lawsuit on Tuesday aiming to block three laws passed by California lawmakers in recent months, arguing in court documents that those laws are intended to obstruct federal officials from enforcing immigration laws.